Localization of the G protein βγ complex in living cells during chemotaxis

Tian Jin, Ning Zhang, Yu Long, Carole A. Parent, Peter N. Devreotes

Research output: Contribution to journalArticlepeer-review

236 Scopus citations


Gradients of chemoattractants elicit signaling events at the leading edge of a cell even though chemoattractant receptors are uniformly distributed on the cell surface. In highly polarized Dictyostelium discoideum amoebas, membrane-associated βγ subunits of heterotrimeric guanine nucleotide-binding proteins (G proteins) were localized in a shallow anterior-posterior gradient. A uniformly applied chemoattractant generated binding sites for pleckstrin homology (PH) domains on the inner surface of the membrane in a pattern similar to that of the Gβγ subunits. Loss of cell polarity resulted in uniform distribution of both the Gβγ subunits and the sensitivity of PH domain recruitment. These observations indicate that Gβγ subunits are not sufficiently localized to restrict signaling events to the leading edge but that their distribution may determine the relative chemotactic sensitivity of polarized cells.

Original languageEnglish (US)
Pages (from-to)1034-1036
Number of pages3
Issue number5455
StatePublished - Feb 11 2000

ASJC Scopus subject areas

  • General


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